Find the area of the shaded figure

Express result to the accuracy of 2 decimal.
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Correct Answers: 
13
Points: 
1

Calculate the number 243

NUMBERMANIA: Calculate the number 243 using numbers [2, 1, 8, 1, 79, 212] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
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Correct Answers: 
1
Points: 
10

Which is a winning combination of digits?

The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
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Correct Answers: 
12
Points: 
1
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